image in book interior

Hello. I've uploaded my book's interior -- pdf -- and there is a small image on the title page. I've used this same image in six other books via Lulu with no trouble. This time I'm told the image is less than 300 ppi -- however, the image *is* 300 ppi -- I checked, and also re-inserted it on the page, saved the book file as a new pdf, and uploaded again. Same error message -- image is less than 300 ppi. Can anyone shed any light? Hopefully -- Pat Bow

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